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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f28ff627212e6bc53636eec0865b72720877a14f035b4b670090ebb9d32aa6' 
  AND token = 'AuqTAAMHI7hMCnrwJDiTraR+QRf1xX95ggMaYgPkrBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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