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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b2731ddc2377753bfcd50b6ab9809637301617639dfa9ed7b9eb6fb005fbdc' 
  AND token = 'rIEgc9DR6ybzBv/pI8GDh+aypiuL5XhSMJmXjDg13a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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