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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fb4e8dd54e56ae96baf529f478ef851028d22764a56358f6ac13c371cffac7' 
  AND token = 'i0fW2qe50+iw4mtqDcSSjK5hl3gPWAw7qlcP6J12bQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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