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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9291d790a51992dc89d1a375e8b7c53851c2548d7f550efe02093ad5eeac97' 
  AND token = 'h8/dRw245BwqQO/RHOgDnMpu9NgVQYgZdKKEd/1uWyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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