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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85da106f9b57477753862137c01573cfecb867d0ed3828d274339c3518a800d3' 
  AND token = 'G9uxJe1I9h/N/GnF/mjvb8nYXnGULlTcY7x7gyC/930=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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