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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc5f4876a4a8cd9961bc4e206d646a3a11a0bd8733295a429b220fe93f98817' 
  AND token = '/UO740swI4jiDI4AhS5AIFJpfW5h8AXBUcUQa6Mm9ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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