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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e6e8bdd809a894c5fc437b71ed61ec8ae8cedc7d04b58e31a3ef51226698b1' 
  AND token = 'ls18cyX8oR9QIX6mLywz2U/pN8+/ZJIA7BHxsD6ldyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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