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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963ec0f5fec6a29a0758f2c34cbc406f20728236d310713bee9458be316bd5d1' 
  AND token = 'tRXAEwojrsbS0pMn5boe804xh/4Aug8DVDYm77gRx0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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