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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e972b0340f3f5d63a2b1e8bc9c3418e8ba83721d671435c1612bfe35a3caf87' 
  AND token = 'choH3gkLPMwCfup2aM0ahc16SYDHomZw4y7mjx6ezgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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