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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160f58b55998f6a76c12ea733a952dc7a0244130d61dbc35a149bb67ec10aa79' 
  AND token = 'wZC6tHbTq5z1AAPYi25FqBKq4Utoeb80xAGMehiwJYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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