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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e043f1a4a93f8b238d8371c4900bda022a1ec47c1b361b859dcd7e0e416950c0' 
  AND token = 'cUtiCTe2QtaWjc3vbUIUHSpAQBXIIaO8g2912L0XZoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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