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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5851a33f7c010308a6ddfdc0c6e4ace9f34899160b21917d64c2ef5c10f21572' 
  AND token = 'c73Pwqkif63bANfr7jH8Q6mYMjTPAakloAd+euEu/tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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