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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2451ac267f07f35aa34cad6a930d3b2d375c91eca689f54bcfcb21ff79c13b' 
  AND token = 'VA/39r7T+VOOygYKuNawFDelx6NiU7Qthe9LDEslQuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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