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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d416b6dba7a1f59ca1590e574c8a527f255671603c748b6601e376d15c4f98c' 
  AND token = 'pkSPUCinF6dppZnbS0dswYA3Udpv8ye+pwSnYgUEoYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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