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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20230f430f1c73dd17f280dbdf83ffbefe6531fcd2c8006c480d677c20107d8' 
  AND token = 'Pb/GPEE7BaeU1uyU8qAbrryt/RzfqJDm+rz9d6p/i9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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