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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750c532db00c96f5edd267890023f77644252382c972dc219eeb0eef2fa2d380' 
  AND token = '6+0bOL+CuexJDHQtt+q3XuAmRfF7GOEpudXECPYYx4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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