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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a0117ce6022e482a7cd1b8d30d154c8bd871ee3bce7621b699fc992e71ddb' 
  AND token = '9D3JcA1s0FEtZSta/24y11UEFiQGLNn5Nz+Pp7X+ORU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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