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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c814fbc26bd6c3fd09794c99b85c86e9d27b6c23632b6781325a6d207aac0d49' 
  AND token = 'gYqc/m9YWibYBqEAme6C+wC8yVYnYegpiGmw9TAQ6Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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