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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47c02520191b88e9f1d2c137a3757684c2829520f5baa4e818b903f49b33fbd' 
  AND token = 'd2C71lgSnFUS1MdmdUGv0+4TUyqqP2v1sUkY5Ld2Zr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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