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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e58d6361a1947885a3b58347857d319bd674d1bf4612d4e4f466606f1153ebd' 
  AND token = 'QHPusP6W5G5AuF/H4tYExpw+EoYAW1GXfL5ntLbpp30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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