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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f0a4fe4decbd5bb2faab6f2ac3952576fc3639c4adf469ee72f0b76317e49e' 
  AND token = 'D0yXLTq0n8Gg/N9NxYXVb7QEeqvH+8M00uULCpGxnQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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