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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de387555403f74eccda4e0e2d78a275094049c52f798f6d18ee99b3dd8c2328d' 
  AND token = 'd4ceD1CqqWJAfaR94Tvk85wFKbH5wEhQTwV0Dzt3W2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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