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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10d90e39e6fa035f6bc8b2c33c28942218aff281af2373e9686291ce1aca9cc' 
  AND token = 'gvk46rBntsZFngGvnBmixBXRmkXhuEpqIeJd3x09VZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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