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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b05642d32ec6863e05f987b8180a305d519363c7ae4486e0666b980d54eabbe' 
  AND token = 'vmrqdLPKHDOmSxLPlHLzJzTEdoRDCleVP8ogieu5ftM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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