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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24acc1dc494cca54597809c6a894f85975026324aa832a14292286a5548cb62' 
  AND token = 'QhVPfcyM86ZagDLkOmK7Zlzb3ed17QHxYj/15qY/DcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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