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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c3dfa201faabbbdcaa3343260d28dd9829ea2b5fd2b9871727a85219843b44' 
  AND token = 'dVun+4XMYT9kgthwNie58eDu2oXoK2aZS0H62grSPyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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