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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2407f311ec14f318b4ae21df1fc0de36fccda4d1eff9146c4392ebe395214d52' 
  AND token = 'iCJ6qLtuygAprtlgN2izpfj2NZoG02lPr+xv/oNzxIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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