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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bd8b2a1ed62a70dc7fbbee95226dda8d2628e5bcecaf1708a4082027783f58' 
  AND token = '8AQq4XPerxj2QzFALfaOf5/w4aLTZ8vLabTgA5X7Fk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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