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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cde074049190910788c57dde921d9740018558d67d8afdd9b753479f75a30e' 
  AND token = 'hFWnwIvVmGMrIBgMpSLTXTexiHaDlAR0Aom38bAaaW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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