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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58de33f8b6ec05417d17606eb7c85bc9419da22ba487d908c01772002dc9df45' 
  AND token = 'MPwJlNi61fnco7/ofsFWGoS1eqNU54lWwwxHvC0oo7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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