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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59807b8c7334b804c0b3e1197d406c0a8d9f8c03060b6ef7a86cce3a5913f26' 
  AND token = 'r9YIm/6VdBJKN/r8h95PVdFXonq2MQb+fFW6PWpRi4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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