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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f1349d1fad195f5a81555f9e1674b8bbe470917100060e8a5c4fcb6c44a23b' 
  AND token = 'H/NmbzI8D5+GdmemckpikeWMwOx7he636mHa+gfKBLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}