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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0734e038a1a0053aa57a7e356c1bc8374204a3b1761d30c165ccae328cdd9fbe' 
  AND token = 'qXOPNXpX88ZSTEg7LM3GEsRj52Y21c2bhWWH1U7iAYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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