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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a7b54956e082ffa786f6d8495b38070cd63fcd2935d913b3b08904c12514b6' 
  AND token = 'keAi36DwsgKG3+pbTaBSeZqs6cryELzko9twMaOmEuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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