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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9cf3f87172f391d466098023543070f26a01b7d28c01f4fc10cf2f04bb0111' 
  AND token = 'QEu3allDGbJSXZnVeS9CK97LlCeb9nDKfyagy46+iY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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