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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e464eb856c22c063a45df52e59a6fe7ce957ea1920289470c12f7d96b4276950' 
  AND token = 'sKWNs9r3Vb7G2i16/Wcr6x0wgt49IVSUHAZaKlB6/pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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