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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971a8ab4f76c47b4f0a1ed57e744151de8ee8dde564d7d61983773f8fd958705' 
  AND token = 'aNa60GLBF339wYwyuZRHLG1eyhV/NEoB7J2EdJE5s7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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