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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c1bfd42a535c45161f4195ecc3e4f15c2c9761014e3f3f4faebe411498b9e6' 
  AND token = 'P2uepvC53CF+MQ+Ub5q+a5fnfnr14BWIvDO1n72pTj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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