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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb047a64c6a0f9bf3e4c925d4fb4531fe8429d7ba679b9b232294e81395c4638' 
  AND token = 'aX3OIB2a8NIh93VAHhCH3ITk41P3fRbo3AkBXjS0zNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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