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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55492919d83a4a00a958f60e3dcf7fd1e29bcac0f8d320690e5e473117f6d29d' 
  AND token = 'lf/aJvH3wQtTdTlnHm9zwYW94x2U+8SPKc2MD/IMKbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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